我想使用 gopacket 从原始字节创建一个数据包并将数据包写入 pcap 文件。
我从原始字节创建了一个 UDP 数据包,如下所示。
package main
import (
"fmt"
"net"
"log"
"os"
"time"
//"encoding/hex"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/pcap"
"github.com/google/gopacket/pcapgo"
)
var (
device string = "eth0"
snapshot_len int32 = 65535
promiscuous bool = false
err error
timeout time.Duration = 30 * time.Second
handle *pcap.Handle
buffer gopacket.SerializeBuffer
options gopacket.SerializeOptions
)
func main() {
ethernetLayer := &layers.Ethernet{
SrcMAC: net.HardwareAddr{0xFF, 0xAA, 0xFA, 0xAA, 0xFF, 0xAA},
DstMAC: net.HardwareAddr{0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD},
}
ipLayer := &layers.IPv4{
SrcIP: net.IP{127,0,0,1},
DstIP: net.IP{8,8,8,8},
}
udpLayer := &layers.UDP{
SrcPort: 51190,
DstPort: 4789,
}
rawBytes := []byte{10, 20, 30}
buffer = gopacket.NewSerializeBuffer()
gopacket.SerializeLayers(buffer, options,
ethernetLayer,
ipLayer,
udpLayer,
gopacket.Payload(rawBytes),
)
outgoingPacket := buffer.Bytes()
fmt.Println(outgoingPacket)
ethpacket := gopacket.NewPacket(outgoingPacket,
layers.LayerTypeEthernet,
gopacket.Default )
我很惊讶如何将这些数据包写入 pcap 文件。这是代码的那一部分。
f, err := os.Create("temp.pcap")
if err != nil {
log.Fatal(err)
os.Exit(1)
}
defer f.Close()
//handle, err = pcap.OpenLive(device, snapshot_len, promiscuous, timeout)
//if err != nil {
// log.Fatal(err)
//}
//defer handle.Close()
//handle.WritePacketData(outgoingPacket)
w := pcapgo.NewWriter(f)
w.WriteFileHeader(uint32(snapshot_len), layers.LinkTypeEthernet)
w.WritePacket(ethpacket.Metadata().CaptureInfo, ethpacket.Data())
这是我得到的错误。请帮助如何进一步进行
[root@centos-sqa-blr01 gopacket]# go run create_pcap.go
#command-line-arguments
./create_pcap.go:75:26: packet.MetaData undefined (type gopacket.Packet 没有字段或方法 MetaData,但是有有元数据)